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134 lines
3.6 KiB
C++
134 lines
3.6 KiB
C++
#include <iostream>
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#include <map>
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#include <pqxx/transaction>
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#include <pqxx/transactor>
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#include "test_helpers.hxx"
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using namespace pqxx;
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// Example program for libpqxx. Modify the database, retaining transactional
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// integrity using the transactor framework.
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//
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// This assumes the existence of a database table "pqxxevents" containing a
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// 2-digit "year" field, which is extended to a 4-digit format by assuming all
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// year numbers of 70 or higher are in the 20th century, and all others in the
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// 21st, and that no years before 1970 are possible.
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namespace
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{
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// Convert year to 4-digit format.
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int To4Digits(int Y)
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{
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int Result{Y};
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PQXX_CHECK(Y >= 0, "Negative year: " + to_string(Y));
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if (Y < 70)
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Result += 2000;
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else if (Y < 100)
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Result += 1900;
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else if (Y < 1970)
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PQXX_CHECK_NOTREACHED("Unexpected year: " + to_string(Y));
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return Result;
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}
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void test_007()
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{
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connection conn;
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conn.set_client_encoding("SQL_ASCII");
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{
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work tx{conn};
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test::create_pqxxevents(tx);
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tx.commit();
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}
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// Perform (an instantiation of) the UpdateYears transactor we've defined
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// in the code above. This is where the work gets done.
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std::map<int, int> conversions;
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perform([&conversions, &conn] {
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work tx{conn};
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// First select all different years occurring in the table.
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result R(tx.exec("SELECT year FROM pqxxevents"));
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// See if we get reasonable type identifier for this column.
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oid const rctype{R.column_type(0)};
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PQXX_CHECK_EQUAL(
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R.column_type(pqxx::row::size_type(0)), rctype,
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"Inconsistent result::column_type().");
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std::string const rct{to_string(rctype)};
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PQXX_CHECK(rctype > 0, "Got strange type ID for column: " + rct);
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std::string const rcol{R.column_name(0)};
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PQXX_CHECK(not std::empty(rcol), "Didn't get a name for column.");
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oid const rcctype{R.column_type(rcol)};
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PQXX_CHECK_EQUAL(
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rcctype, rctype, "Column type is not what it is by name.");
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oid const rawrcctype{R.column_type(rcol)};
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PQXX_CHECK_EQUAL(
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rawrcctype, rctype, "Column type by C-style name is different.");
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// Note all different years currently occurring in the table, writing
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// them and their correct mappings to conversions.
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for (auto const &r : R)
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{
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int Y{0};
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// Read year, and if it is non-null, note its converted value
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if (r[0] >> Y)
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conversions[Y] = To4Digits(Y);
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// See if type identifiers are consistent
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oid const tctype{r.column_type(0)};
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PQXX_CHECK_EQUAL(
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tctype, r.column_type(pqxx::row::size_type(0)),
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"Inconsistent pqxx::row::column_type()");
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PQXX_CHECK_EQUAL(
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tctype, rctype,
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"pqxx::row::column_type() is inconsistent with "
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"result::column_type().");
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oid const ctctype{r.column_type(rcol)};
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PQXX_CHECK_EQUAL(
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ctctype, rctype, "Column type lookup by column name is broken.");
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oid const rawctctype{r.column_type(rcol)};
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PQXX_CHECK_EQUAL(
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rawctctype, rctype, "Column type lookup by C-style name is broken.");
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oid const fctype{r[0].type()};
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PQXX_CHECK_EQUAL(fctype, rctype, "Field type lookup is broken.");
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}
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// For each occurring year, write converted date back to whereever it may
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// occur in the table. Since we're in a transaction, any changes made by
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// others at the same time will not affect us.
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for (auto const &c : conversions)
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{
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auto const query{
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"UPDATE pqxxevents "
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"SET year=" +
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to_string(c.second) +
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" "
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"WHERE year=" +
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to_string(c.first)};
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R = tx.exec0(query);
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}
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});
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}
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PQXX_REGISTER_TEST(test_007);
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} // namespace
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